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                                <h2 id="&#x7269;&#x7406;&#x5185;&#x5B58;&#x7BA1;&#x7406;">&#x7269;&#x7406;&#x5185;&#x5B58;&#x7BA1;&#x7406;</h2>
<h3 id="&#x7269;&#x7406;&#x9875;">&#x7269;&#x7406;&#x9875;</h3>
<p>&#x901A;&#x5E38;&#xFF0C;&#x6211;&#x4EEC;&#x5728;&#x5206;&#x914D;&#x7269;&#x7406;&#x5185;&#x5B58;&#x65F6;&#x5E76;&#x4E0D;&#x662F;&#x4EE5;&#x5B57;&#x8282;&#x4E3A;&#x5355;&#x4F4D;&#xFF0C;&#x800C;&#x662F;&#x4EE5;&#x4E00;<strong>&#x7269;&#x7406;&#x9875;&#xFF08;Frame&#xFF09;</strong>&#xFF0C;&#x5373;&#x8FDE;&#x7EED;&#x7684; 4 KB &#x5B57;&#x8282;&#x4E3A;&#x5355;&#x4F4D;&#x5206;&#x914D;&#x3002;&#x6211;&#x4EEC;&#x5E0C;&#x671B;&#x7528;&#x7269;&#x7406;&#x9875;&#x53F7;&#xFF08;Physical Page Number&#xFF0C;PPN&#xFF09;&#x6765;&#x4EE3;&#x8868;&#x4E00;&#x7269;&#x7406;&#x9875;&#xFF0C;&#x5B9E;&#x9645;&#x4E0A;&#x4EE3;&#x8868;&#x7269;&#x7406;&#x5730;&#x5740;&#x8303;&#x56F4;&#x5728; <span class="katex"><span class="katex-mathml"><math><semantics><mrow><mo>[</mo><mtext><mi mathvariant="normal">P</mi><mi mathvariant="normal">P</mi><mi mathvariant="normal">N</mi></mtext><mo>&#xD7;</mo><mn>4</mn><mtext><mi mathvariant="normal">K</mi><mi mathvariant="normal">B</mi></mtext><mo separator="true">,</mo><mo>(</mo><mtext><mi mathvariant="normal">P</mi><mi mathvariant="normal">P</mi><mi mathvariant="normal">N</mi></mtext><mo>+</mo><mn>1</mn><mo>)</mo><mo>&#xD7;</mo><mn>4</mn><mtext><mi mathvariant="normal">K</mi><mi mathvariant="normal">B</mi></mtext><mo>)</mo></mrow><annotation encoding="application/x-tex">[\text{PPN}\times 4\text{KB},(\text{PPN}+1)\times 4\text{KB})</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="strut" style="height:0.75em;"></span><span class="strut bottom" style="height:1em;vertical-align:-0.25em;"></span><span class="base textstyle uncramped"><span class="mopen">[</span><span class="mord text textstyle uncramped"><span class="mord mathrm">PPN</span></span><span class="mbin">&#xD7;</span><span class="mord mathrm">4</span><span class="mord text textstyle uncramped"><span class="mord mathrm">KB</span></span><span class="mpunct">,</span><span class="mopen">(</span><span class="mord text textstyle uncramped"><span class="mord mathrm">PPN</span></span><span class="mbin">+</span><span class="mord mathrm">1</span><span class="mclose">)</span><span class="mbin">&#xD7;</span><span class="mord mathrm">4</span><span class="mord text textstyle uncramped"><span class="mord mathrm">KB</span></span><span class="mclose">)</span></span></span></span> &#x7684;&#x4E00;&#x7269;&#x7406;&#x9875;&#x3002;</p>
<p>&#x4E0D;&#x96BE;&#x770B;&#x51FA;&#xFF0C;&#x7269;&#x7406;&#x9875;&#x53F7;&#x4E0E;&#x7269;&#x7406;&#x9875;&#x5F62;&#x6210;&#x4E00;&#x4E00;&#x6620;&#x5C04;&#x3002;&#x4E3A;&#x4E86;&#x80FD;&#x591F;&#x4F7F;&#x7528;&#x7269;&#x7406;&#x9875;&#x53F7;&#x8FD9;&#x79CD;&#x8868;&#x8FBE;&#x65B9;&#x5F0F;&#xFF0C;&#x6BCF;&#x4E2A;&#x7269;&#x7406;&#x9875;&#x7684;&#x5F00;&#x5934;&#x5730;&#x5740;&#x5FC5;&#x987B;&#x662F; 4 KB &#x7684;&#x500D;&#x6570;&#x3002;&#x4F46;&#x8FD9;&#x4E5F;&#x7ED9;&#x4E86;&#x6211;&#x4EEC;&#x4E00;&#x4E2A;&#x65B9;&#x4FBF;&#xFF1A;&#x5BF9;&#x4E8E;&#x4E00;&#x4E2A;&#x7269;&#x7406;&#x5730;&#x5740;&#xFF0C;&#x5176;&#x9664;&#x4EE5; 4096&#xFF08;&#x6216;&#x8005;&#x8BF4;&#x53F3;&#x79FB; 12 &#x4F4D;&#xFF09;&#x7684;&#x5546;&#x5373;&#x4E3A;&#x8FD9;&#x4E2A;&#x7269;&#x7406;&#x5730;&#x5740;&#x6240;&#x5728;&#x7684;&#x7269;&#x7406;&#x9875;&#x53F7;&#x3002;</p>
<p>&#x540C;&#x6837;&#x7684;&#xFF0C;&#x6211;&#x4EEC;&#x8FD8;&#x662F;&#x7528;&#x4E00;&#x4E2A;&#x65B0;&#x7684;&#x7ED3;&#x6784;&#x6765;&#x5C01;&#x88C5;&#x4E00;&#x4E0B;&#x7269;&#x7406;&#x9875;&#xFF0C;&#x4E00;&#x662F;&#x4E3A;&#x4E86;&#x548C;&#x5176;&#x4ED6;&#x7C7B;&#x578B;&#x5730;&#x5740;&#x4F5C;&#x533A;&#x5206;&#xFF1B;&#x4E8C;&#x662F;&#x6211;&#x4EEC;&#x53EF;&#x4EE5;&#x540C;&#x65F6;&#x5B9E;&#x73B0;&#x4E00;&#x4E9B;&#x9875;&#x5E27;&#x548C;&#x5730;&#x5740;&#x76F8;&#x4E92;&#x8F6C;&#x6362;&#x7684;&#x529F;&#x80FD;&#x3002;&#x4E3A;&#x4E86;&#x540E;&#x9762;&#x7684;&#x65B9;&#x4FBF;&#xFF0C;&#x6211;&#x4EEC;&#x4E5F;&#x628A;&#x865A;&#x62DF;&#x5730;&#x5740;&#x548C;&#x865A;&#x62DF;&#x9875;&#xFF08;&#x6982;&#x5FF5;&#x8FD8;&#x6CA1;&#x6709;&#x6D89;&#x53CA;&#xFF0C;&#x540E;&#x9762;&#x7684;&#x6307;&#x5BFC;&#x4F1A;&#x8FDB;&#x4E00;&#x6B65;&#x8BB2;&#x89E3;&#xFF09;&#x4E00;&#x5E76;&#x5B9E;&#x73B0;&#x51FA;&#x6765;&#xFF0C;&#x8FD9;&#x90E8;&#x5206;&#x4EE3;&#x7801;&#x8BF7;&#x53C2;&#x8003; <code>os/src/memory/address.rs</code>&#x3002;</p>
<p>&#x540C;&#x65F6;&#xFF0C;&#x6211;&#x4EEC;&#x4E5F;&#x9700;&#x8981;&#x5728; <code>os/src/memory/config.rs</code> &#x4E2D;&#x52A0;&#x5165;&#x76F8;&#x5173;&#x7684;&#x8BBE;&#x7F6E;&#xFF1A;</p>
<p></p><p class="code-label">os/src/memory/config.rs</p><p></p>
<pre><code class="lang-rust"><span class="hljs-comment">/// &#x9875; / &#x5E27;&#x5927;&#x5C0F;&#xFF0C;&#x5FC5;&#x987B;&#x662F; 2^n</span>
<span class="hljs-keyword">pub</span> <span class="hljs-keyword">const</span> PAGE_SIZE: usize = <span class="hljs-number">4096</span>;

<span class="hljs-comment">/// &#x53EF;&#x4EE5;&#x8BBF;&#x95EE;&#x7684;&#x5185;&#x5B58;&#x533A;&#x57DF;&#x8D77;&#x59CB;&#x5730;&#x5740;</span>
<span class="hljs-keyword">pub</span> <span class="hljs-keyword">const</span> MEMORY_START_ADDRESS: PhysicalAddress = PhysicalAddress(<span class="hljs-number">0x8000_0000</span>);
<span class="hljs-comment">/// &#x53EF;&#x4EE5;&#x8BBF;&#x95EE;&#x7684;&#x5185;&#x5B58;&#x533A;&#x57DF;&#x7ED3;&#x675F;&#x5730;&#x5740;</span>
<span class="hljs-keyword">pub</span> <span class="hljs-keyword">const</span> MEMORY_END_ADDRESS: PhysicalAddress = PhysicalAddress(<span class="hljs-number">0x8800_0000</span>);
</code></pre>
<h3 id="&#x5206;&#x914D;&#x548C;&#x56DE;&#x6536;">&#x5206;&#x914D;&#x548C;&#x56DE;&#x6536;</h3>
<p>&#x4E3A;&#x4E86;&#x65B9;&#x4FBF;&#x7BA1;&#x7406;&#x6240;&#x6709;&#x7684;&#x7269;&#x7406;&#x9875;&#xFF0C;&#x6211;&#x4EEC;&#x9700;&#x8981;&#x5B9E;&#x73B0;&#x4E00;&#x4E2A;&#x5206;&#x914D;&#x5668;&#x53EF;&#x4EE5;&#x8FDB;&#x884C;&#x5206;&#x914D;&#x548C;&#x56DE;&#x6536;&#x7684;&#x64CD;&#x4F5C;&#xFF0C;&#x5728;&#x8FD9;&#x4E4B;&#x524D;&#xFF0C;&#x6211;&#x4EEC;&#x9700;&#x8981;&#x5148;&#x628A;&#x7269;&#x7406;&#x9875;&#x7684;&#x6982;&#x5FF5;&#x8FDB;&#x884C;&#x5C01;&#x88C5;&#x3002;&#x6CE8;&#x610F;&#x5230;&#xFF0C;&#x7269;&#x7406;&#x9875;&#x5B9E;&#x9645;&#x4E0A;&#x662F;&#x4E00;&#x5757;&#x8FDE;&#x7EED;&#x7684;&#x5185;&#x5B58;&#x533A;&#x57DF;&#xFF0C;&#x8FD9;&#x91CC;&#x6211;&#x4EEC;&#x53EA;&#x662F;&#x628A;&#x5185;&#x5B58;&#x533A;&#x57DF;&#x7684;&#x8D77;&#x59CB;&#x7269;&#x7406;&#x5730;&#x5740;&#x5C01;&#x88C5;&#x5230;&#x4E86;&#x4E00;&#x4E2A; <code>FrameTracker</code> &#x91CC;&#x9762;&#x3002;</p>
<p></p><p class="code-label">os/src/memory/frame/frame_tracker.rs</p><p></p>
<pre><code class="lang-rust"><span class="hljs-comment">/// &#x5206;&#x914D;&#x51FA;&#x7684;&#x7269;&#x7406;&#x9875;</span>
<span class="hljs-comment">///</span>
<span class="hljs-comment">/// # `Tracker` &#x662F;&#x4EC0;&#x4E48;&#xFF1F;</span>
<span class="hljs-comment">/// &#x592A;&#x957F;&#x4E0D;&#x770B;</span>
<span class="hljs-comment">/// &gt; &#x53EF;&#x4EE5;&#x7406;&#x89E3;&#x4E3A; [`Box`](alloc::boxed::Box)&#xFF0C;&#x800C;&#x533A;&#x522B;&#x5728;&#x4E8E;&#xFF0C;&#x5176;&#x7A7A;&#x95F4;&#x4E0D;&#x662F;&#x5206;&#x914D;&#x5728;&#x5806;&#x4E0A;&#xFF0C;</span>
<span class="hljs-comment">/// &gt; &#x800C;&#x662F;&#x76F4;&#x63A5;&#x5728;&#x5185;&#x5B58;&#x4E2D;&#x5212;&#x4E00;&#x7247;&#xFF08;&#x4E00;&#x4E2A;&#x7269;&#x7406;&#x9875;&#xFF09;&#x3002;</span>
<span class="hljs-comment">///</span>
<span class="hljs-comment">/// &#x5728;&#x6211;&#x4EEC;&#x5B9E;&#x73B0;&#x64CD;&#x4F5C;&#x7CFB;&#x7EDF;&#x7684;&#x8FC7;&#x7A0B;&#x4E2D;&#xFF0C;&#x4F1A;&#x7ECF;&#x5E38;&#x9047;&#x5230;&#x300C;&#x6307;&#x5B9A;&#x4E00;&#x5757;&#x5185;&#x5B58;&#x533A;&#x57DF;&#x4F5C;&#x4E3A;&#x67D0;&#x79CD;&#x7528;&#x5904;&#x300D;&#x7684;&#x60C5;&#x51B5;&#x3002;</span>
<span class="hljs-comment">/// &#x6B64;&#x65F6;&#xFF0C;&#x6211;&#x4EEC;&#x8BF4;&#x8FD9;&#x5757;&#x5185;&#x5B58;&#x53EF;&#x4EE5;&#x7528;&#xFF0C;&#x4F46;&#x662F;&#x56E0;&#x4E3A;&#x5B83;&#x4E0D;&#x5728;&#x5806;&#x6808;&#x4E0A;&#xFF0C;Rust &#x7F16;&#x8BD1;&#x5668;&#x5E76;&#x4E0D;&#x77E5;&#x9053;&#x5B83;&#x662F;&#x4EC0;&#x4E48;&#xFF0C;&#x6240;&#x4EE5;</span>
<span class="hljs-comment">/// &#x6211;&#x4EEC;&#x9700;&#x8981; unsafe &#x5730;&#x5C06;&#x5176;&#x8F6C;&#x6362;&#x4E3A; `&amp;&apos;static mut T` &#x7684;&#x5F62;&#x5F0F;&#xFF08;`&apos;static` &#x4E00;&#x822C;&#x53EF;&#x4EE5;&#x7701;&#x7565;&#xFF09;&#x3002;</span>
<span class="hljs-comment">///</span>
<span class="hljs-comment">/// &#x4F46;&#x662F;&#xFF0C;&#x6BD4;&#x5982;&#x6211;&#x4EEC;&#x7528;&#x4E00;&#x5757;&#x5185;&#x5B58;&#x6765;&#x4F5C;&#x4E3A;&#x9875;&#x8868;&#xFF0C;&#x800C;&#x5F53;&#x8FD9;&#x4E2A;&#x9875;&#x8868;&#x6211;&#x4EEC;&#x4E0D;&#x518D;&#x9700;&#x8981;&#x7684;&#x65F6;&#x5019;&#xFF0C;&#x5C31;&#x5E94;&#x5F53;&#x91CA;&#x653E;&#x7A7A;&#x95F4;&#x3002;</span>
<span class="hljs-comment">/// &#x6211;&#x4EEC;&#x5176;&#x5B9E;&#x66F4;&#x9700;&#x8981;&#x4E00;&#x4E2A;&#x50CF;&#x300C;&#x521B;&#x5EFA;&#x4E00;&#x4E2A;&#x6709;&#x751F;&#x547D;&#x671F;&#x7684;&#x5BF9;&#x8C61;&#x300D;&#x4E00;&#x6837;&#x7684;&#x6A21;&#x5F0F;&#x6765;&#x4F7F;&#x7528;&#x8FD9;&#x5757;&#x5185;&#x5B58;&#x3002;&#x56E0;&#x6B64;&#xFF0C;</span>
<span class="hljs-comment">/// &#x6211;&#x4EEC;&#x4E0D;&#x59A8;&#x7528; `Tracker` &#x7C7B;&#x578B;&#x6765;&#x5C01;&#x88C5;&#x8FD9;&#x6837;&#x4E00;&#x4E2A; `&amp;&apos;static mut` &#x5F15;&#x7528;&#x3002;</span>
<span class="hljs-comment">///</span>
<span class="hljs-comment">/// &#x4F7F;&#x7528; `Tracker` &#x5176;&#x5B9E;&#x5C31;&#x5F88;&#x50CF;&#x4F7F;&#x7528;&#x4E00;&#x4E2A; smart pointer&#x3002;&#x5982;&#x679C;&#x9700;&#x8981;&#x5F15;&#x7528;&#x8BA1;&#x6570;&#xFF0C;</span>
<span class="hljs-comment">/// &#x5C31;&#x5728;&#x5916;&#x9762;&#x518D;&#x5957;&#x4E00;&#x5C42; [`Arc`](alloc::sync::Arc) &#x5C31;&#x597D;</span>
<span class="hljs-keyword">pub</span> <span class="hljs-class"><span class="hljs-keyword">struct</span> <span class="hljs-title">FrameTracker</span></span>(<span class="hljs-keyword">pub</span>(<span class="hljs-keyword">super</span>) PhysicalPageNumber);

<span class="hljs-keyword">impl</span> FrameTracker {
    <span class="hljs-comment">/// &#x5E27;&#x7684;&#x7269;&#x7406;&#x5730;&#x5740;</span>
    <span class="hljs-keyword">pub</span> <span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">address</span></span>(&amp;<span class="hljs-keyword">self</span>) -&gt; PhysicalAddress {
        <span class="hljs-keyword">self</span>.<span class="hljs-number">0</span>.into()
    }
    <span class="hljs-comment">/// &#x5E27;&#x7684;&#x7269;&#x7406;&#x9875;&#x53F7;</span>
    <span class="hljs-keyword">pub</span> <span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">page_number</span></span>(&amp;<span class="hljs-keyword">self</span>) -&gt; PhysicalPageNumber {
        <span class="hljs-keyword">self</span>.<span class="hljs-number">0</span>
    }
}

<span class="hljs-comment">/// &#x5E27;&#x5728;&#x91CA;&#x653E;&#x65F6;&#x4F1A;&#x653E;&#x56DE; [`static@FRAME_ALLOCATOR`] &#x7684;&#x7A7A;&#x95F2;&#x94FE;&#x8868;&#x4E2D;</span>
<span class="hljs-keyword">impl</span> <span class="hljs-built_in">Drop</span> <span class="hljs-keyword">for</span> FrameTracker {
    <span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">drop</span></span>(&amp;<span class="hljs-keyword">mut</span> <span class="hljs-keyword">self</span>) {
        FRAME_ALLOCATOR.lock().dealloc(<span class="hljs-keyword">self</span>);
    }
}
</code></pre>
<p>&#x8FD9;&#x91CC;&#xFF0C;&#x6211;&#x4EEC;&#x5B9E;&#x73B0;&#x4E86; <code>FrameTracker</code> &#x8FD9;&#x4E2A;&#x7ED3;&#x6784;&#xFF0C;&#x800C;&#x533A;&#x5206;&#x4E8E;&#x5B9E;&#x9645;&#x5728;&#x5185;&#x5B58;&#x4E2D;&#x7684; 4KB &#x5927;&#x5C0F;&#x7684; &quot;Frame&quot;&#xFF0C;&#x6211;&#x4EEC;&#x8BBE;&#x8BA1;&#x7684;&#x521D;&#x8877;&#x662F;&#x5206;&#x914D;&#x5668;&#x5206;&#x914D;&#x7ED9;&#x6211;&#x4EEC; <code>FrameTracker</code> &#x4F5C;&#x4E3A;&#x4E00;&#x4E2A;&#x5E27;&#x7684;&#x6807;&#x8BC6;&#xFF0C;&#x800C;&#x968F;&#x7740;&#x4E0D;&#x518D;&#x9700;&#x8981;&#x8FD9;&#x4E2A;&#x7269;&#x7406;&#x9875;&#xFF0C;&#x6211;&#x4EEC;&#x9700;&#x8981;&#x56DE;&#x6536;&#xFF0C;&#x6211;&#x4EEC;&#x5229;&#x7528; Rust &#x7684; drop &#x673A;&#x5236;&#x5728;&#x6790;&#x6784;&#x7684;&#x65F6;&#x5019;&#x81EA;&#x52A8;&#x5B9E;&#x73B0;&#x56DE;&#x6536;&#x3002;</p>
<p>&#x6700;&#x540E;&#xFF0C;&#x6211;&#x4EEC;&#x5C01;&#x88C5;&#x4E00;&#x4E2A;&#x7269;&#x7406;&#x9875;&#x5206;&#x914D;&#x5668;&#xFF0C;&#x4E3A;&#x4E86;&#x7B26;&#x5408;&#x66F4; Rust &#x89C4;&#x8303;&#x7684;&#x8BBE;&#x8BA1;&#xFF0C;&#x8FD9;&#x4E2A;&#x5206;&#x914D;&#x5668;&#x5C06;&#x4E0D;&#x6D89;&#x53CA;&#x4EFB;&#x4F55;&#x7684;&#x5177;&#x4F53;&#x7B97;&#x6CD5;&#xFF0C;&#x5177;&#x4F53;&#x7684;&#x7B97;&#x6CD5;&#x5C06;&#x7528;&#x4E00;&#x4E2A;&#x540D;&#x4E3A; <code>Allocator</code> &#x7684; Rust trait &#x5C01;&#x88C5;&#x8D77;&#x6765;&#xFF0C;&#x800C;&#x6211;&#x4EEC;&#x7684; <code>FrameAllocator</code> &#x4F1A;&#x4F9D;&#x8D56;&#x4E8E;&#x5177;&#x4F53;&#x7684; trait &#x5B9E;&#x73B0;&#x4F8B;&#x5316;&#x3002;</p>
<p></p><p class="code-label">os/src/memory/frame/allocator.rs</p><p></p>
<pre><code class="lang-rust">lazy_static! {
    <span class="hljs-comment">/// &#x5E27;&#x5206;&#x914D;&#x5668;</span>
    <span class="hljs-keyword">pub</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">ref</span> FRAME_ALLOCATOR: Mutex&lt;FrameAllocator&lt;AllocatorImpl&gt;&gt; = Mutex::new(FrameAllocator::new(Range::from(
            PhysicalPageNumber::ceil(PhysicalAddress::from(*KERNEL_END_ADDRESS))..PhysicalPageNumber::floor(MEMORY_END_ADDRESS),
        )
    ));
}

<span class="hljs-comment">/// &#x57FA;&#x4E8E;&#x7EBF;&#x6BB5;&#x6811;&#x7684;&#x5E27;&#x5206;&#x914D; / &#x56DE;&#x6536;</span>
<span class="hljs-keyword">pub</span> <span class="hljs-class"><span class="hljs-keyword">struct</span> <span class="hljs-title">FrameAllocator</span></span>&lt;T: Allocator&gt; {
    <span class="hljs-comment">/// &#x53EF;&#x7528;&#x533A;&#x95F4;&#x7684;&#x8D77;&#x59CB;</span>
    start_ppn: PhysicalPageNumber,
    <span class="hljs-comment">/// &#x5206;&#x914D;&#x5668;</span>
    allocator: T,
}

<span class="hljs-keyword">impl</span>&lt;T: Allocator&gt; FrameAllocator&lt;T&gt; {
    <span class="hljs-comment">/// &#x521B;&#x5EFA;&#x5BF9;&#x8C61;</span>
    <span class="hljs-keyword">pub</span> <span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">new</span></span>(range: <span class="hljs-keyword">impl</span> <span class="hljs-built_in">Into</span>&lt;Range&lt;PhysicalPageNumber&gt;&gt; + <span class="hljs-built_in">Copy</span>) -&gt; <span class="hljs-keyword">Self</span> {
        FrameAllocator {
            start_ppn: range.into().start,
            allocator: T::new(range.into().len()),
        }
    }

    <span class="hljs-comment">/// &#x5206;&#x914D;&#x5E27;&#xFF0C;&#x5982;&#x679C;&#x6CA1;&#x6709;&#x5269;&#x4F59;&#x5219;&#x8FD4;&#x56DE; `Err`</span>
    <span class="hljs-keyword">pub</span> <span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">alloc</span></span>(&amp;<span class="hljs-keyword">mut</span> <span class="hljs-keyword">self</span>) -&gt; MemoryResult&lt;FrameTracker&gt; {
        <span class="hljs-keyword">self</span>.allocator
            .alloc()
            .ok_or(<span class="hljs-string">&quot;no available frame to allocate&quot;</span>)
            .map(|offset| FrameTracker(<span class="hljs-keyword">self</span>.start_ppn + offset))
    }

    <span class="hljs-comment">/// &#x5C06;&#x88AB;&#x91CA;&#x653E;&#x7684;&#x5E27;&#x6DFB;&#x52A0;&#x5230;&#x7A7A;&#x95F2;&#x5217;&#x8868;&#x7684;&#x5C3E;&#x90E8;</span>
    <span class="hljs-comment">///</span>
    <span class="hljs-comment">/// &#x8FD9;&#x4E2A;&#x51FD;&#x6570;&#x4F1A;&#x5728; [`FrameTracker`] &#x88AB; drop &#x65F6;&#x81EA;&#x52A8;&#x8C03;&#x7528;&#xFF0C;&#x4E0D;&#x5E94;&#x5728;&#x5176;&#x4ED6;&#x5730;&#x65B9;&#x8C03;&#x7528;</span>
    <span class="hljs-keyword">pub</span>(<span class="hljs-keyword">super</span>) <span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">dealloc</span></span>(&amp;<span class="hljs-keyword">mut</span> <span class="hljs-keyword">self</span>, frame: &amp;FrameTracker) {
        <span class="hljs-keyword">self</span>.allocator.dealloc(frame.page_number() - <span class="hljs-keyword">self</span>.start_ppn);
    }
}
</code></pre>
<p>&#x8FD9;&#x4E2A;&#x5206;&#x914D;&#x5668;&#x4F1A;&#x4EE5;&#x4E00;&#x4E2A; <code>PhysicalPageNumber</code> &#x7684; <code>Range</code> &#x521D;&#x59CB;&#x5316;&#xFF0C;&#x7136;&#x540E;&#x628A;&#x8D77;&#x59CB;&#x5730;&#x5740;&#x8BB0;&#x5F55;&#x4E0B;&#x6765;&#xFF0C;&#x628A;&#x6574;&#x4E2A;&#x533A;&#x95F4;&#x7684;&#x957F;&#x5EA6;&#x544A;&#x8BC9;&#x5177;&#x4F53;&#x7684;&#x5206;&#x914D;&#x5668;&#x7B97;&#x6CD5;&#xFF0C;&#x5F53;&#x5206;&#x914D;&#x7684;&#x65F6;&#x5019;&#x5C31;&#x4ECE;&#x7B97;&#x6CD5;&#x4E2D;&#x53D6;&#x5F97;&#x4E00;&#x4E2A;&#x53EF;&#x7528;&#x7684;&#x4F4D;&#x7F6E;&#x4F5C;&#x4E3A; <code>offset</code>&#xFF0C;&#x518D;&#x52A0;&#x4E0A;&#x8D77;&#x59CB;&#x5730;&#x5740;&#x8FD4;&#x56DE;&#x56DE;&#x53BB;&#x3002;</p>
<p>&#x6709;&#x5173;&#x5177;&#x4F53;&#x7684;&#x7B97;&#x6CD5;&#xFF0C;&#x6211;&#x4EEC;&#x5C01;&#x88C5;&#x4E86;&#x4E00;&#x4E2A;&#x5206;&#x914D;&#x5668;&#x9700;&#x8981;&#x7684; Rust trait&#xFF1A;</p>
<p></p><p class="code-label">os/src/algorithm/src/allocator/mod.rs</p><p></p>
<pre><code class="lang-rust"><span class="hljs-comment">/// &#x5206;&#x914D;&#x5668;&#xFF1A;&#x56FA;&#x5B9A;&#x5BB9;&#x91CF;&#xFF0C;&#x6BCF;&#x6B21;&#x5206;&#x914D; / &#x56DE;&#x6536;&#x4E00;&#x4E2A;&#x5143;&#x7D20;</span>
<span class="hljs-keyword">pub</span> <span class="hljs-class"><span class="hljs-keyword">trait</span> <span class="hljs-title">Allocator</span></span> {
    <span class="hljs-comment">/// &#x7ED9;&#x5B9A;&#x5BB9;&#x91CF;&#xFF0C;&#x521B;&#x5EFA;&#x5206;&#x914D;&#x5668;</span>
    <span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">new</span></span>(capacity: usize) -&gt; <span class="hljs-keyword">Self</span>;
    <span class="hljs-comment">/// &#x5206;&#x914D;&#x4E00;&#x4E2A;&#x5143;&#x7D20;&#xFF0C;&#x65E0;&#x6CD5;&#x5206;&#x914D;&#x5219;&#x8FD4;&#x56DE; `None`</span>
    <span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">alloc</span></span>(&amp;<span class="hljs-keyword">mut</span> <span class="hljs-keyword">self</span>) -&gt; <span class="hljs-built_in">Option</span>&lt;usize&gt;;
    <span class="hljs-comment">/// &#x56DE;&#x6536;&#x4E00;&#x4E2A;&#x5143;&#x7D20;</span>
    <span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">dealloc</span></span>(&amp;<span class="hljs-keyword">mut</span> <span class="hljs-keyword">self</span>, index: usize);
}
</code></pre>
<p>&#x5E76;&#x5728; <code>os/src/algorithm/src/allocator/</code> &#x4E2D;&#x5206;&#x522B;&#x5B9E;&#x73B0;&#x4E86;&#x6808;&#x5F0F;&#x5206;&#x914D;&#x548C;&#x7EBF;&#x6BB5;&#x6811;&#x5206;&#x914D;&#xFF0C;&#x5177;&#x4F53;&#x5185;&#x5BB9;&#x53EF;&#x4EE5;&#x53C2;&#x8003;&#x4EE3;&#x7801;&#x3002;</p>
<p>&#x9700;&#x8981;&#x6CE8;&#x610F;&#xFF0C;&#x6211;&#x4EEC;&#x4F7F;&#x7528;&#x4E86; <code>lazy_static!</code> &#x548C; <code>Mutex</code> &#x6765;&#x5305;&#x88C5;&#x5206;&#x914D;&#x5668;&#xFF0C;&#x4E14;&#x5BF9;&#x4E8E; <code>static mut</code> &#x7C7B;&#x578B;&#x7684;&#x4FEE;&#x6539;&#x64CD;&#x4F5C;&#x662F; unsafe &#x7684;&#x3002;&#x5BF9;&#x4E8E;&#x9759;&#x6001;&#x5168;&#x5C40;&#x6570;&#x636E;&#xFF0C;&#x6240;&#x6709;&#x7684;&#x7EBF;&#x7A0B;&#x90FD;&#x80FD;&#x8BBF;&#x95EE;&#x3002;&#x5F53;&#x4E00;&#x4E2A;&#x7EBF;&#x7A0B;&#x6B63;&#x5728;&#x8BBF;&#x95EE;&#x8FD9;&#x6BB5;&#x6570;&#x636E;&#x7684;&#x65F6;&#x5019;&#xFF0C;&#x5982;&#x679C;&#x53E6;&#x4E00;&#x4E2A;&#x7EBF;&#x7A0B;&#x4E5F;&#x6765;&#x8BBF;&#x95EE;&#xFF0C;&#x5C31;&#x53EF;&#x80FD;&#x4F1A;&#x4EA7;&#x751F;&#x51B2;&#x7A81;&#xFF0C;&#x5E76;&#x5E26;&#x6765;&#x96BE;&#x4EE5;&#x9884;&#x6D4B;&#x7684;&#x7ED3;&#x679C;&#x3002;&#x6211;&#x4EEC;&#x5728;&#x540E;&#x9762;&#x7684;&#x7AE0;&#x8282;&#x4F1A;&#x8FDB;&#x4E00;&#x6B65;&#x4ECB;&#x7ECD;&#x7EBF;&#x7A0B;&#x548C; Mutex &#x7B49;&#x6982;&#x5FF5;&#x3002;</p>
<p>&#x6240;&#x4EE5;&#x6211;&#x4EEC;&#x7684;&#x65B9;&#x6CD5;&#x662F;&#x4F7F;&#x7528; <code>spin::Mutex&lt;T&gt;</code> &#x7ED9;&#x8FD9;&#x6BB5;&#x6570;&#x636E;&#x52A0;&#x4E00;&#x628A;&#x9501;&#xFF0C;&#x4E00;&#x4E2A;&#x7EBF;&#x7A0B;&#x8BD5;&#x56FE;&#x901A;&#x8FC7; <code>lock()</code> &#x6253;&#x5F00;&#x9501;&#x6765;&#x83B7;&#x53D6;&#x5185;&#x90E8;&#x6570;&#x636E;&#x7684;&#x53EF;&#x53D8;&#x5F15;&#x7528;&#xFF0C;&#x5982;&#x679C;&#x94A5;&#x5319;&#x88AB;&#x522B;&#x7684;&#x7EBF;&#x7A0B;&#x6240;&#x5360;&#x7528;&#xFF0C;&#x90A3;&#x4E48;&#x8FD9;&#x4E2A;&#x7EBF;&#x7A0B;&#x5C31;&#x4F1A;&#x4E00;&#x76F4;&#x5361;&#x5728;&#x8FD9;&#x91CC;&#xFF1B;&#x76F4;&#x5230;&#x90A3;&#x4E2A;&#x5360;&#x7528;&#x4E86;&#x94A5;&#x5319;&#x7684;&#x7EBF;&#x7A0B;&#x5BF9;&#x5185;&#x90E8;&#x6570;&#x636E;&#x7684;&#x8BBF;&#x95EE;&#x7ED3;&#x675F;&#xFF0C;&#x9501;&#x88AB;&#x91CA;&#x653E;&#xFF0C;&#x5C06;&#x94A5;&#x5319;&#x4EA4;&#x8FD8;&#x51FA;&#x6765;&#xFF0C;&#x88AB;&#x5361;&#x4F4F;&#x7684;&#x90A3;&#x4E2A;&#x7EBF;&#x7A0B;&#x62FF;&#x5230;&#x4E86;&#x94A5;&#x5319;&#xFF0C;&#x5C31;&#x53EF;&#x6253;&#x5F00;&#x9501;&#x83B7;&#x53D6;&#x5185;&#x90E8;&#x5F15;&#x7528;&#xFF0C;&#x8BBF;&#x95EE;&#x5185;&#x90E8;&#x6570;&#x636E;&#x3002;</p>
<p>&#x8FD9;&#x91CC;&#x4F7F;&#x7528;&#x7684;&#x662F; <code>spin::Mutex&lt;T&gt;</code>&#xFF0C;&#x6211;&#x4EEC;&#x9700;&#x8981;&#x5728; <code>os/Cargo.toml</code> &#x4E2D;&#x6DFB;&#x52A0;&#x4F9D;&#x8D56;&#x3002;&#x5E78;&#x8FD0;&#x7684;&#x662F;&#xFF0C;&#x5B83;&#x4E5F;&#x65E0;&#x9700;&#x4EFB;&#x4F55;&#x64CD;&#x4F5C;&#x7CFB;&#x7EDF;&#x652F;&#x6301;&#xFF08;&#x5373;&#x652F;&#x6301; <code>no_std</code>&#xFF09;&#xFF0C;&#x6211;&#x4EEC;&#x53EF;&#x4EE5;&#x653E;&#x5FC3;&#x4F7F;&#x7528;&#x3002;</p>
<p>&#x6700;&#x540E;&#xFF0C;&#x6211;&#x4EEC;&#x628A;&#x65B0;&#x5199;&#x7684;&#x6A21;&#x5757;&#x52A0;&#x8F7D;&#x8FDB;&#x6765;&#xFF0C;&#x5E76;&#x5728; main &#x51FD;&#x6570;&#x4E2D;&#x8FDB;&#x884C;&#x7B80;&#x5355;&#x7684;&#x6D4B;&#x8BD5;&#xFF1A;</p>
<p></p><p class="code-label">os/src/main.rs</p><p></p>
<pre><code class="lang-rust"><span class="hljs-comment">/// Rust &#x7684;&#x5165;&#x53E3;&#x51FD;&#x6570;</span>
<span class="hljs-comment">///</span>
<span class="hljs-comment">/// &#x5728; `_start` &#x4E3A;&#x6211;&#x4EEC;&#x8FDB;&#x884C;&#x4E86;&#x4E00;&#x7CFB;&#x5217;&#x51C6;&#x5907;&#x4E4B;&#x540E;&#xFF0C;&#x8FD9;&#x662F;&#x7B2C;&#x4E00;&#x4E2A;&#x88AB;&#x8C03;&#x7528;&#x7684; Rust &#x51FD;&#x6570;</span>
<span class="hljs-meta">#[no_mangle]</span>
<span class="hljs-keyword">pub</span> <span class="hljs-keyword">extern</span> <span class="hljs-string">&quot;C&quot;</span> <span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">rust_main</span></span>() -&gt; ! {
    <span class="hljs-comment">// &#x521D;&#x59CB;&#x5316;&#x5404;&#x79CD;&#x6A21;&#x5757;</span>
    interrupt::init();
    memory::init();

    <span class="hljs-comment">// &#x7269;&#x7406;&#x9875;&#x5206;&#x914D;</span>
    <span class="hljs-keyword">for</span> _ <span class="hljs-keyword">in</span> <span class="hljs-number">0</span>..<span class="hljs-number">2</span> {
        <span class="hljs-keyword">let</span> frame_0 = <span class="hljs-keyword">match</span> memory::frame::FRAME_ALLOCATOR.lock().alloc() {
            <span class="hljs-built_in">Result</span>::<span class="hljs-literal">Ok</span>(frame_tracker) =&gt; frame_tracker,
            <span class="hljs-built_in">Result</span>::<span class="hljs-literal">Err</span>(err) =&gt; <span class="hljs-built_in">panic!</span>(<span class="hljs-string">&quot;{}&quot;</span>, err)
        };
        <span class="hljs-keyword">let</span> frame_1 = <span class="hljs-keyword">match</span> memory::frame::FRAME_ALLOCATOR.lock().alloc() {
            <span class="hljs-built_in">Result</span>::<span class="hljs-literal">Ok</span>(frame_tracker) =&gt; frame_tracker,
            <span class="hljs-built_in">Result</span>::<span class="hljs-literal">Err</span>(err) =&gt; <span class="hljs-built_in">panic!</span>(<span class="hljs-string">&quot;{}&quot;</span>, err)
        };
        <span class="hljs-built_in">println!</span>(<span class="hljs-string">&quot;{} and {}&quot;</span>, frame_0.address(), frame_1.address());
    }

    <span class="hljs-built_in">panic!</span>()
}
</code></pre>
<p>&#x53EF;&#x4EE5;&#x770B;&#x5230;&#x7C7B;&#x4F3C;&#x8FD9;&#x6837;&#x7684;&#x8F93;&#x51FA;&#xFF1A;</p>
<p></p><p class="code-label">&#x8FD0;&#x884C;&#x8F93;&#x51FA;</p><p></p>
<pre><code>PhysicalAddress(0x80a14000) and PhysicalAddress(0x80a15000)
PhysicalAddress(0x80a14000) and PhysicalAddress(0x80a15000)
</code></pre><p>&#x6211;&#x4EEC;&#x53EF;&#x4EE5;&#x770B;&#x5230; <code>frame_0</code> &#x548C; <code>frame_1</code> &#x4F1A;&#x88AB;&#x81EA;&#x52A8;&#x6790;&#x6784;&#x7136;&#x540E;&#x56DE;&#x6536;&#xFF0C;&#x7B2C;&#x4E8C;&#x6B21;&#x53C8;&#x5206;&#x914D;&#x540C;&#x6837;&#x7684;&#x5730;&#x5740;&#x3002;</p>
<h3 id="&#x601D;&#x8003;">&#x601D;&#x8003;</h3>
<p>&#x8FD0;&#x884C;&#x4E0B;&#x9762;&#x7684;&#x4EE3;&#x7801;&#xFF1A;</p>
<p></p><p class="code-label">os/src/main.rs</p><p></p>
<pre><code class="lang-rust"><span class="hljs-comment">/// Rust &#x7684;&#x5165;&#x53E3;&#x51FD;&#x6570;</span>
<span class="hljs-comment">///</span>
<span class="hljs-comment">/// &#x5728; `_start` &#x4E3A;&#x6211;&#x4EEC;&#x8FDB;&#x884C;&#x4E86;&#x4E00;&#x7CFB;&#x5217;&#x51C6;&#x5907;&#x4E4B;&#x540E;&#xFF0C;&#x8FD9;&#x662F;&#x7B2C;&#x4E00;&#x4E2A;&#x88AB;&#x8C03;&#x7528;&#x7684; Rust &#x51FD;&#x6570;</span>
<span class="hljs-meta">#[no_mangle]</span>
<span class="hljs-keyword">pub</span> <span class="hljs-keyword">extern</span> <span class="hljs-string">&quot;C&quot;</span> <span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">rust_main</span></span>() -&gt; ! {
    <span class="hljs-comment">// &#x521D;&#x59CB;&#x5316;&#x5404;&#x79CD;&#x6A21;&#x5757;</span>
    interrupt::init();
    memory::init();

    <span class="hljs-comment">// &#x7269;&#x7406;&#x9875;&#x5206;&#x914D;</span>
    <span class="hljs-keyword">match</span> memory::frame::FRAME_ALLOCATOR.lock().alloc() {
            <span class="hljs-built_in">Result</span>::<span class="hljs-literal">Ok</span>(frame_tracker) =&gt; frame_tracker,
            <span class="hljs-built_in">Result</span>::<span class="hljs-literal">Err</span>(err) =&gt; <span class="hljs-built_in">panic!</span>(<span class="hljs-string">&quot;{}&quot;</span>, err)
    };

    <span class="hljs-built_in">panic!</span>()
</code></pre>
<p>&#x601D;&#x8003;&#xFF0C;&#x548C;&#x4E0A;&#x9762;&#x7684;&#x4EE3;&#x7801;&#x6709;&#x4F55;&#x4E0D;&#x540C;&#xFF0C;&#x6211;&#x4EEC;&#x7684;&#x8BBE;&#x8BA1;&#x662F;&#x5426;&#x5B58;&#x5728;&#x4E00;&#x4E9B;&#x8BED;&#x6CD5;&#x4E0A;&#x7684;&#x8BBE;&#x8BA1;&#x7F3A;&#x9677;&#xFF1F;</p>
<div class="click_reveal"><span> Click to show </span><div><blockquote>
<p>&#x8FD9;&#x91CC;&#x7684; <code>frame_tracker</code> &#x53D8;&#x91CF;&#x4F1A;&#x5728; <code>match</code> &#x8BED;&#x6CD5;&#x91CC;&#x9762;&#x6790;&#x6784;&#x3002;&#x4F46;&#x662F;&#x6790;&#x6784;&#x7684;&#x65F6;&#x5019;&#xFF0C;&#x5916;&#x5C42;&#x7684; <code>lock()</code> &#x51FD;&#x6570;&#x8FD8;&#x6CA1;&#x6709;&#x91CA;&#x653E;&#x9501;&#xFF0C;&#x8FD9;&#x6837;&#x5199;&#x4F1A;&#x5BFC;&#x81F4;&#x6B7B;&#x9501;&#x3002;</p>
</blockquote>
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